About: http://webisa.webdatacommons.org/196354958

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	And I tried a lot of sites, including the ones that you mention and other usual suspects.
http://www.w3.org/ns/prov#wasQuotedFrom	slashdot.org